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9bb914a3a5
Force unwrapping the expression and propagating that type down to the rest of the tree causes crashes when we go to request a different set of protocols than we were expecting from it later. Make this transformation local to the apply instead.
32 lines
901 B
Swift
32 lines
901 B
Swift
// RUN: %target-typecheck-verify-swift
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var t = true
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var f = false
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func markUsed<T>(_ t: T) {}
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markUsed(t != nil) // expected-warning {{comparing non-optional value of type 'Bool' to nil always returns true}}
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markUsed(f != nil) // expected-warning {{comparing non-optional value of type 'Bool' to nil always returns true}}
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class C : Equatable {}
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func == (lhs: C, rhs: C) -> Bool {
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return true
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}
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func test(_ c: C) {
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if c == nil {} // expected-warning {{comparing non-optional value of type 'C' to nil always returns false}}
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}
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class D {}
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var d = D()
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var dopt: D? = nil
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var diuopt: D! = nil
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_ = d! // expected-error {{cannot force unwrap value of non-optional type 'D'}}
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_ = dopt == nil
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_ = diuopt == nil
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_ = diuopt is ExpressibleByNilLiteral // expected-warning {{'is' test is always true}}
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// expected-warning@-1 {{conditional cast from 'D!' to 'ExpressibleByNilLiteral' always succeeds}}
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